IT WAS LATE JUNE in Sarajevo when Gavrilo Princip shot Archduke Franz Ferdinand and his wife.
那是在六月底的萨拉热窝，加夫里洛?普林齐普举枪向弗朗茨?斐迪南大公和他的妻子射击。
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Employing relevant knowledge on urban traffic, it clarifies the relationship between the density, width and other properties of urban roads, and obtains the princip…